Wpf Binding Stringformat 仅显示第一个字符

问题描述

有什么办法可以让我只能在文本块上显示绑定字符串的第一个字符..?

Is there any way so that i can show only first character of a Bound string on a textblock..?

例如；如果我绑定男"，我的文本块应该只显示M".....

For eg;If i Bind 'Male', my textblock should only show 'M'.....

推荐答案

您可以使用值转换器返回字符串前缀:

You might use a value converter to return a string prefix:

class PrefixValueConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string s = value.ToString();
        int prefixLength;
        if (!int.TryParse(parameter.ToString(), out prefixLength) ||
            s.Length <= prefixLength)
        {
            return s;
        }
        return s.Substring(0, prefixLength);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

在 XAML 中:

<Window.Resources>
    ...
    <local:PrefixValueConverter x:Key="PrefixValueConverter"/>
</Window.Resources>
...
...{Binding Path=TheProperty, Converter={StaticResource PrefixValueConverter},
                              ConverterParameter=1}...

这篇关于Wpf Binding Stringformat 仅显示第一个字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！